topic Re: Modifying symbol properties at runtime in ArcGIS API for Silverlight Questions

Modifying symbol properties at runtime

linusang — Mon, 02 Aug 2010 03:02:44 GMT

Hi, I would like the user to be able to change color and width of the LineSymbol class

i tried this in my resource dictionary...

<esri:LineSymbol x:Key="DefaultLineSymbol">
        <esri:LineSymbol.ControlTemplate>
            <ControlTemplate>
                <Path x:Name="Element" Stroke="{TemplateBinding Color}" StrokeThickness="{TemplateBinding Width}" />
            </ControlTemplate>
        </esri:LineSymbol.ControlTemplate>
    </esri:LineSymbol>

but there is a compile error saying ColorProperty is not in Control type

Any suggestions?

Re: Modifying symbol properties at runtime

DominiqueBroux — Mon, 02 Aug 2010 10:48:13 GMT

Try binding to the symbol:

<esri:LineSymbol x:Key="DefaultLineSymbol">
        <esri:LineSymbol.ControlTemplate>
            <ControlTemplate>
                <Path x:Name="Element" Stroke="{Binding Symbol.Color}" StrokeThickness="{Binding Symbol.Width}" />
            </ControlTemplate>
        </esri:LineSymbol.ControlTemplate>
    </esri:LineSymbol>

Re: Modifying symbol properties at runtime

MartenLiebster — Sun, 12 Dec 2021 06:31:18 GMT

Not sure if it's the preferred way or not, but I did this in my symbol and it works fine:

(I realize the context is a bit different, in that I did inside of a MarkerSymbol instead)

<Ellipse 
  Fill="{Binding Attributes, 
         Converter={StaticResource DictionaryConverter}, 
         ConverterParameter=EllipseFill, 
         Mode=OneWay}"
                                     Height="10"
                                     HorizontalAlignment="Left"
                                     Margin="-5,-5,0,0"
                                     VerticalAlignment="Top"
                                     Width="10" />

The EllipseFill value comes from the graphic's attribute collection.

*** EDIT ****

Looking over the blogs and changes for 2.0, looks like the converter is no longer needed.

An updated way might be like this:

<Ellipse 
  Fill="{Binding Attributes[EllipseFill], Mode=OneWay}"
                                     Height="10"
                                     HorizontalAlignment="Left"
                                     Margin="-5,-5,0,0"
                                     VerticalAlignment="Top"
                                     Width="10" />

Re: Modifying symbol properties at runtime

linusang — Tue, 03 Aug 2010 03:29:07 GMT

Try binding to the symbol:

Thanks this works great...